I'm developing an R package, and I'm trying to make a link from the manual of the package to its vignette (a pdf). I've make this in the R function code, and it works:
\link[=../doc/package.pdf]{package's User Manual}
The problem is that the devtools::check() complains with a warning, which also causes a delay in the process of revision when uploading to CRAN...
* checking Rd cross-references ... WARNING
Missing link or links in documentation object 'package.Rd':
'../doc/package.pdf'
Is there a better way of linking from man to vignette? or it is not correct to do so? As the pdf can contain more graphical information, it seems desirable to be able to link to it.